The full story of Raikkonen's shock Sauber switch

Kimi Raikkonen rejoining Sauber after leaving Ferrari was unthinkable just one year ago, but that's exactly what Formula 1 is going to get in 2019. And the reason he is making a rare switch back down the grid is very simple

Kimi Raikkonen's return to Sauber in 2019 is one of the most extraordinary stories of a busy and unpredictable Formula 1 silly season.

Most observers took the view that if and when Charles Leclerc was confirmed at Ferrari, the ousted Raikkonen - who turns 39 next month - would slip away into retirement. Why would he want to take a few steps down the grid when he's spent most of his career in cars that at least had a shot of winning races?